Blood Pressure Category Checker
Check your blood pressure reading against AHA/JNC 8 guidelines and understand what it means.
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How to use this calculator
Blood pressure is classified using the 2017 AHA guidelines based on systolic and diastolic values. Mean Arterial Pressure (MAP) represents average pressure in the arteries during one cardiac cycle. Pulse pressure reflects arterial stiffness — widening with age is a cardiovascular risk marker.
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Take your blood pressure reading using a validated cuff — sit quietly for 5 minutes before measuring.
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Enter the top number (systolic) and bottom number (diastolic) from your reading.
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Your AHA blood pressure category, pulse pressure, and MAP will be displayed with personalised guidance.
Frequently asked questions
What do the two numbers in a blood pressure reading mean?
The top number (systolic) is the pressure in your arteries when your heart beats and pumps blood. The bottom number (diastolic) is the pressure when your heart rests between beats. Both numbers matter — you can have isolated systolic or isolated diastolic hypertension. The AHA 2017 guidelines classify blood pressure based on whichever number places you in the higher category.
How often should I check my blood pressure?
For adults with normal blood pressure, checking annually during a routine health visit is sufficient. If you have elevated or Stage 1 hypertension, checking monthly at home helps track trends. For Stage 2 hypertension or anyone on medication, your doctor will advise frequency. Home monitoring is most accurate when measured at the same time each day, twice per reading, and averaged.
What is Mean Arterial Pressure (MAP) and why does it matter?
MAP represents the average pressure in the arteries throughout one complete cardiac cycle. It is the pressure that organs actually experience. A MAP above 60 mmHg is generally needed to perfuse vital organs. Critical care clinicians target MAPs of 65–70 mmHg or above in patients with shock. A high MAP indicates sustained excessive pressure on arterial walls and organs.
Blood Pressure Category Checker — AHA 2017 Guidelines
Understanding Blood Pressure Categories
The American Heart Association (AHA) updated its blood pressure guidelines in 2017, lowering the threshold for Stage 1 Hypertension from 140/90 mmHg to 130/80 mmHg. This change was based on evidence that cardiovascular risk increases significantly above 130/80, not just above 140/90. Under the 2017 AHA classification: Normal is below 120/80 mmHg; Elevated is systolic 120–129 with diastolic below 80; Stage 1 Hypertension is 130–139 systolic or 80–89 diastolic; Stage 2 Hypertension is 140/90 or above; and Hypertensive Crisis is above 180/120 — a medical emergency. A single elevated reading does not diagnose hypertension — diagnosis requires consistently elevated readings across multiple visits.
Pulse Pressure and Mean Arterial Pressure Explained
Pulse pressure (systolic minus diastolic) is an important but often overlooked cardiovascular marker. A normal pulse pressure is 40–60 mmHg. A widening pulse pressure (above 60 mmHg) in older adults indicates arterial stiffness — the arteries cannot expand and recoil efficiently — and is an independent predictor of cardiovascular events. A narrow pulse pressure (below 25 mmHg) can indicate low cardiac output. Mean Arterial Pressure (MAP) is calculated as diastolic plus one-third of pulse pressure, approximating the average organ perfusion pressure. Normal MAP is 70–100 mmHg. These derived values give clinicians additional insight beyond the two raw blood pressure numbers.
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